Command                                 Special     Single command arguments
      BACK  Backspace                       Line-edit        -    -    -    - 
    CTRL_A  Set mode                        Line-edit        -    -    -    - 
    CTRL_G  Clear                           Line-edit        -    -    -    - 
       DEL  Del                             Line-edit        -    -    -    - 
      DOWN  Cursor down                     Line-edit        -    -    -    - 
      LEFT  Cursor left                     Line-edit        -    -    -    - 
     RIGHT  Cursor right                    Line-edit        -    -    -    - 
        UP  Cursor up                       Line-edit        -    -    -    -